7 But since he was by temperament proud, impatient, and sometimes obstinate, Bobola had to wage a very sharp contest against himself, and ascend his Calvary, as it were, laden with the cross, in order to reach the height of this virtue. There, at length, impelled and assisted by the grace he had obtained by constant and fervent prayers, he might be able to reach Christian perfection, for as St. Bernard wisely said, "the spiritual edifice cannot possibly stand except on the firm foundation of humility."
Source: Invicti Athletae (Vatican.va)